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How do I use de Moivre's formula to evaluate (cos pi/7 + i sin pi/7) ^7 in cartesian form? What is the lewis structure for OF? How and why did we evolve to have quick wit and humor? What is the molecular structure of the stable form of FNO2? (N is the central atom.)? What kind of bug is this? I was just watching a show in bed and it started crawling on my arm. Also, is it harmful?